🟧 Product Overview
Martensitic stainless steel coils are designed for high strength, hardness, and wear resistance. They offer:
- High mechanical strength
- Excellent hardenability
- Good wear resistance
- Moderate corrosion resistance
- Magnetic properties
- Suitable for heat treatment (quenching & tempering)
This series is widely used in tools, mechanical components, and industrial wear‑resistant applications.
403 — Basic Martensitic Stainless Steel
- Moderate corrosion resistance
- Good mechanical strength
- Suitable for turbine blades and general mechanical parts
410 — General‑Purpose Martensitic Stainless Steel
- Most widely used martensitic grade
- Good strength and hardness after heat treatment
- Ideal for valves, fasteners, and mechanical components
416 — Free‑Machining Martensitic Stainless Steel
- Sulfur‑enhanced for excellent machinability
- Best machinability among martensitic grades
- Suitable for precision machined parts
420 — High‑Hardness Martensitic Stainless Steel
- Can be hardened to high levels
- Used for knives, cutting tools, and wear‑resistant parts
440C — Premium High‑Carbon Martensitic Stainless Steel
- Highest hardness and wear resistance in the series
- Excellent for bearings, blades, and high‑precision tools
🟧 Available Grades
403, 410, 416, 420, 440C
🟧 Standards
- ASTM A240 / A480
- JIS G4304 / G4305
- EN 10088‑2
- GB/T 3280
🟧 Chemical Composition (Typical)
| Element | 403 (%) | 410 (%) | 416 (%) | 420 (%) | 440C (%) |
|---|
| C | 0.08–0.15 | 0.08–0.15 | 0.15–0.30 | 0.16–0.25 | 0.95–1.20 |
| Cr | 11.5–13.0 | 11.5–13.5 | 12.0–14.0 | 12.0–14.0 | 16.0–18.0 |
| Ni | ≤0.5 | ≤0.75 | ≤0.75 | ≤0.75 | ≤0.75 |
| Mn | ≤1.0 | ≤1.0 | ≤1.25 | ≤1.0 | ≤1.0 |
| S | ≤0.03 | ≤0.03 | 0.15–0.35 | ≤0.03 | ≤0.03 |
Note:
- 416’s high sulfur content is the key factor behind its excellent free‑machining performance.
- 440C’s high carbon content enables extremely high hardness after heat treatment.
🟧 Mechanical Properties (Typical)
| Grade | Yield Strength | Tensile Strength | Hardness (HRC) |
|---|
| 403 | ≥240 MPa | ≥450 MPa | 35–45 |
| 410 | ≥240 MPa | ≥480 MPa | 40–48 |
| 416 | ≥275 MPa | ≥550 MPa | 35–45 |
| 420 | ≥275 MPa | ≥700 MPa | 48–52 |
| 440C | ≥285 MPa | ≥760 MPa | 56–60 |
🟧 Product Specifications
Thickness
Width
Surface Finishes
🟧 Applications
403 — Mechanical Components
- Turbine blades
- General mechanical parts
410 — General‑Purpose Applications
- Valves
- Fasteners
- Pump components
- Industrial parts
416 — Free‑Machining Applications
- Precision machined parts
- Shafts
- Screws
- Gears
420 — High‑Hardness Applications
- Knives
- Cutting tools
- Surgical instruments
- Wear‑resistant components
440C — Extreme Wear‑Resistance Applications
- Bearings
- High‑precision tools
- High‑end blades
- Mechanical seals
🟧 Why Choose WelSteels
- Full martensitic stainless steel coil supply (403 / 410 / 416 / 420 / 440C)
- Heat‑treatable high‑strength materials
- Excellent hardness and wear resistance
- SGS / BV inspection available
- Export‑grade seaworthy packaging
